Temporal parameters of ultrashort pulse laser and ultrashort pulse laser measuring instrument cannot be traced to the International System of Units for a long time due to the lack of measurement standards. This paper introduces the measurement standard for time-domain parameters of ultrashort pulse laser at the National Institute of Metrology (NIM), China. An instrument based on Spectral Phase Interferometry for Direct Electric-field Reconstruction (SPIDER) was constructed. The spectral phase of femtosecond pulse laser was automatically and accurately extracted with wavelet-transform technology, and the time-domain waveform of the ultrashort pulses was precisely reconstructed with the inverse Fourier-transform technique. The expanded uncertainty is U_rel=8% (k=2) in a measurement range of 10~500 fs. A large range autocorrelator was developed. The accurate measurement and traceability of ultrashort pulse width in the range of 10 fs~50 ps are realized, and the expanded uncertainty is U_rel=10% (k=2). The national measurement standard "Calibration setup for ultrashort optical pulse autocorrelators” was established, and the expanded uncertainty is U_rel=10% (k=2) in a measurement range of 10 fs~12 ps. The measurement standard provides an accurate traceable standard for ultrashort pulse measurement instruments, and plays an important role in ensuring the accuracy and consistency for the measurement results of ultrashort pulse temporal parameters.