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In July 1935, Heinkel received an order from the Japanese Navy to design and build two prototypes of the prototype aircraft, which had to meet the following requirements:

is a carrier-based single-engine dive bomber with a crew of two.
– all-metal monoplane with the following maximum dimensions: Wingspan 11.4 m, length 9.4 m, height 3.8 m.
- wing consoles should fold to the rear of the fuselage.
- Hörnet or Cyclon engine or German engine, which could be produced in Japan under a German license.
Equipment:

Radio station, 1×150 kg bomb, 2 Vickers 7.7 mm machine guns with 600 rounds of ammunition, one Lewis 7.7 mm mobile machine gun.

The maximum speed at an altitude of 3000 m is 408 km/h, the landing speed is 111 km/h, the time to climb 3000 meters is 6 minutes, the flight range is 1575 km with a flight duration of 5 hours at a speed of 315 km/h, the turning radius during the attack is 400 m, the takeoff run with a headwind of 10 m/s is 100 m.

In October 1935, the Heinkel project for the Japanese Navy was designated P 1030, and the first discussion took place between representatives of the Japanese Navy and Heinkel on the use of a two-seat dive bomber as a carrier-based aircraft. At the same time, it was decided that the Heinkel company should, on the basis of Japanese drawings, develop a mechanical device for suspending and dropping the 150 kg bomb provided for this aircraft. It was decided to use a conventional sight with notches and a front sight as sights. Japanese representatives put forward a requirement to install a German DLH 20 radar station with a capacity of 20 watts with a range of 250 km on the aircraft.

As for the choice of the power plant, there were several options in this regard. The issue of installing imported engines from Wright Cyclon, Bristol Pegasus, as well as P&W Hörnet was considered. These power plants were initially preferred. This was followed by the German-made SAM 22-B and BMW 135 engines. In addition to these engines, the installation of a G&R Mistral engine was considered. For the future, in case of interruptions in the supply of power plants, it was planned to install Japanese-made engines. The second question concerned the choice of propeller. Heinkel made a proposal to use a standard "Constant speed" type propeller.

The wing was supposed to have a single-spar design with air brakes. At the same time, the wing consoles had to fold.

The following work plan was drawn up:

– 20.10.1935 – Heinkel receives permission from RLM to further develop the project in accordance with the order received from Japan.
- until 31.1.1936 - delivery to Heinkel from Japanese customers of the engine, drawings of bombs and other equipment, as well as various assembly data.
– in the period 1.2.1936 – 15.3.1936 – construction of a full-scale model according to the requirements agreed with the RLM.
– in the period 15.3.1936-30.4.1936 – inspection and making possible changes to the model. Determination of the final version of the project.
- in the period 1, 5.1936-31. 8.1936 - design development.
— 1. 9.1936 – 31.12.1936 aircraft assembly.
- 1.1.1937 - the first flight of a prototype.
— 1.5.1937 — the transfer of the prototype No1 to the customer.
- On 1.7.1937, the second prototype was handed over.
The Japanese offered to train their own engineers in the process of working on prototypes and wished to send the following employees to Germany for this purpose:

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