Abstract： The Xilin bearing combine is an important part of the card . Its machining quantity affects the working stability and the service life of the card. So it machining accuracy have higher request. Particularly the combine face of the bearings cover and the bearing body andthe bearings bore have the very high request. The assurance of these accuracies is the keytechnique and difference of this process rules. To preferring the characteristics of he connecting rod of the United States races car and the condition of the machining etc, this craft rules are well designed. The contents mainly includes: the semi-finished product really settles, the choice of the fixed position basis, the part preface remaining measure assurance etc..