Abstract: This paper models Generic Technology R&D contract considering government technical support with a three-stage game, and studies generic technology R&D contract design which aims to maximize firm R&D input in the government perspective for the first time. Here are main results: When the government budget is enough large, the optimal generic technology R&D contract exists only. The optimal contract terms increases with the increase of budget and the optimal effort level for firm increases more quickly. Firm optimal input and the influence coefficient of firm and government which is related to generic technology R&D success is positive correlation and negatively related to the unit cost coefficient of the two sides. Considering the marketization process, Firm optimal R&D input, which is positive correlation to product market capacity based on generic technology, is negatively related to the degree of the externality of generic technology, difficulty of subsequent development, the product price sensitive coefficient and the unit cost of sales.