The chemical diffusion coefficient (D), as an intuitive indicator for diffusion kinetics of ions in electrode materials, plays an essential role in determining material selection and predicting electrochemical properties. However, there are always some loopholes in the application of galvanostatic intermittent titration technique (GITT) as a conventional tool for testing the D value. Research has shown that the improper use of the GITT model and the wrong selection of important parameters of equations are the critical factors causing the order of magnitude difference in the results. To improve the accuracy of the D value, we have formulated the standards for the above issues, and analyzed the assumptions under different conditions. Moreover, a series of special measures that can improve the test results and new methods derived from GITT are rationally integrated. The GITT's suitability analysis and usage standards will enhance the efficiency and accuracy in obtaining the D values towards the effective optimization of electrode materials for advanced electrochemical energy storage devices.