Abstract: In Augsest through september 1990,the first test to demonstrate the capability of The National Primary GPS Network(NAGNET) was conducted in North-East China by Wuhan Technical University of Surveying and Mapping and Heilongjiang Provihncial Bureau of Surveying and Mapping.The test is successful.The mumverical results have preliminarily demonstrated the technical feasibility and accuracy capability of the National Primary GPS Network,whose technical scheme was designed by WTUSM.The test has provided some field experience which is very useful for the full operation of the NAGNET Some sobervation schemes and datavalidation approaches of data collections for the NAGNET project are also discussed.