In laser mental deposition, in order to ensure the forming quality of specimens,the key factor is to find mutual matching process parameters.Using many groups of contrast test, influence law that the process parameters on the of deposition surface forming quality is inquired by changing respectively laser power, scanning speed, send powder rate and the scanning interval. According to the law, the process parameters and powder melting rate relationship formula is summed up. And a series of mutual matching process parameters is calculated.