Collaborative design is a new method for mechanical design and manufacture, how to improve the ability of design is the point problem. Data translation is a key problem for collaborative e design. In the paper, the problem of data translation is solved. Different design software for designer can complete the same task, which is based on the data transition and translation. The XML style of data is established, which is applied to express the relationship of data. The XML to STEP style is presented for system. Data can be transmitted among different software. The integration of system is established. At last, a prototype system is presented to demonstrate the methodology.