Abstract: The limitation of design resources and the parallelism of design activities lead to resource conflicts in collaborative product design process.In order to solve this problem,a resource constraint net model based on time-constrained Petri nets for collaborative design process is proposed in this paper.Firstly,definitions of schedulability for design activity transition with both single input and multi-inputs,and judgment rules for the schedulability are denoted.Then the schedulability of resource constraints for collaborative design is divided into weak scheduling and strong scheduling.By introducing the concepts of the upper and lower time border for token of transition sequence to reach resource place,the rules and algorithm of resource constraint schedulability for collaborative design process are proposed.Finally a collaborative design resource constraint model for a chain-transportation driving system is tested to validate the feasibility of the approach.