To build a standard test specification for solar cells, various kinds of affect factors on the final uncertainty of solar cell standard tests were evaluated and selected. Based on the secondary solar cell standard test equipment and devices, such as sun simulator, spectral sensitivity, IV tester and standard solar cells, several kinds of testing technologies were researched. Some effect factors in measuring processing were discussed, including the spatial uncertainty of solar cell simulator, temporal stability, measuring repeatability, the uncertainty from sweep directions, the reflection and transparence of cell, the uncertainty for area and External Quantum Efficiency (EQE). Then, the measuring procedure of a high efficiency crystalline silicon solar cell was proposed and the extension test uncertainty of 3.94% was derived under the conditions of existing laboratory measurement .Based on a comparison to conventional solar cell test data, the conventional cell testing method was improved, and the uncertainty of measurement was reduced by 0.19%. Finally, a standard testing procedure for a double-side cell was proposed, which provides a reference for other related cell measurements.