Abstract
The rotation curve of our Galaxy is derived from a large sample of objects with known radial velocities and distances. We collect data as completely as possible, especially the data with accurately measured trigonometric parallaxes. These observations are used to construct a highly accurate rotation curve of the Galaxy. We discuss how to optimize the source selection for fitting the rotation curve. For each sample we adopted new selection criteria that remove data with large errors. We adopt the more reasonable Galactic constants R0 =8.0kpc, V0 = 220.0km/s. The results show that the fitting curve is a little bit higher for the outer Galaxy and lower for the inner Galaxy than previous results. For the first time we give out the errors of the formulary parameters.
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