For analyzing the X-ray pulsed signal observation capability of micro-channel plate detector, a long-time experiment of micro-channel plate detectors under different radiation flux and different background noise was operated on the X-ray detector ground testing system. Meanwhile, a set of evaluation methods of pulse observation capability of X-ray detectors were established, the expressions of the signal-to-noise ratio, the correlation of pulse profile, the measurement accuracy of pulse arrival time, the minimum detectable power were derived based on the photon counting model. 8 groups of 10 000 s X-ray photon time-of-arrival dataset were received by the 20 cm2 micro-channel plate detectors. Then the effective observation data were dealt with, the pulse period of each dataset was gained, the observable pulse profile was replicated, and their characteristic parameters were estimated. The experimental result shows that the micro-channel plate detector has a good capability of X-ray pulse signal observation and reconstruction, the signal-to-noise ratio, the correlation of pulse profile, the measurement accuracy of pulse arrival time of the observed pulse profile are 35.73, 88.38%, 51.53 μs at the low pulse signal flux (the X-photon flux density is 0.05 ph/cm2/s), while those are 35.73, 88.38%, 51.53 μs at strong background noise(the background noise is 16 times the intensity of the pulse signal). This result has revealed that the micro-channel plate detector has the observation ability of a certain faint X ray pulsar. The pulse detection capability of micro-channel plate detector is improved with the increase of the intensity of the pulse signal, the decrease of the background noise intensity and the increase of the accumulated observation time.