A CPIII planar network measurement method, comprising the following steps: (1) erecting an all-station measurement instrument between two CPIII points on a left and a right line, inserting a CPIII prism on the total 12 CPIII points composed of 6 pairs of points of the left and right lines in front of and behind the all-station measurement instruments, and on 3 CPIII connecting points arranged between the left and right lines; (2) when measurement of said station is complete, moving the last four prisms on the left and right lines and the final connecting prism between the right and left lines to the very front according to the forward direction of the measurement, and respectively moving forward the all-station measurement instruments on the left and rights lines to between the next but one pair of CPIII points, again erecting a station for measurement, and measuring the 15 CPIII points composed of the front and rear six pairs and the 3 connecting points between the left and right lines; repeating the observation in this way ensures that each CPIII point is observed at least 3 times, thereby implementing measurement of each CPIII point. The present method solves the problems of the CPIII control points of the magnetic-levitation track not being visible during the transport operating period as a result of being blocked by the middle evacuation platform of the left and right lines, and being unable to erect stations on the platform to implement observation.
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