As the important service show way of cloud computing, SaaS has been the rise completely innovative software application mode in the market. It uses the Internet to provide calculation service, and uses the SaaS service software for specific industries and areas, no matter from the technical or business will save a lot of human and financial resources cost, also more conducive to improving the utilization rate of social resources and sharing. To further enhance the safety of domestic food, comprehensive promotion food monitoring and food management software application, this paper puts forward the food security traceability system based on SaaS Model. The article combines the food industry business requirements and SaaS model of service features, and probes into the system in the process of implementing the difficulties SaaS technology, finally successfully reach maturity of the SaaS model 4 system, this system can not only ensure the safety of the domestic food distribution, but also effectively promote the SaaS model of business system platform in the cloud in the calculation of the application.