Given the lack of in-service assessment standards for space tracking telemetry and control （TTC） equipment， this paper analyzes the current standard situation， and combs the existing space equipment related standards that can be used for in-service assessment. The reference standard is put forward for the evaluation of tracking quality stability of space TTC equipment. The applicability of the standard to the in-service evaluation requirements is analyzed. The evaluation subjects of tracking quality stability are modified and expanded. The practical engineering example shows that the assessment effect is reasonable and effective， and the tracking assessment standard of quality stability can provide reference for the formulation of in-service assessment standard.