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Due to the data characteristics of high rate and large amount of high-dynamic GNSS receiver, high demand of the integrity of navigation data acquisition is proposed. According to the demand, the acquisition integrity of navigation data is researched, three kinds of methods for acquiring navigation data which include timing, event triggers and double buffering is designed. Since the problem of data truncation, the data loss rate of timing method is 15.72%, which is applicable to the environment of less data and low rate; Although effective to avoid data truncation, the data loss rate of event trigger methods is 11.88% due to buffer overflow, which is applicable to the environment of short-term acquisition; Double-buffer method effectively solves the problem of data truncation and buffer overflow, thus data loss rate is 0, which is applicable to the high-dynamic environment. Finally, the method of double-buffer is applied to acquire navigation data of high-dynamic GNSS receiver. The results show that the method can acquire data efficiently and completely.