The company did not explain the sharp rise which was against the trend in the property markets of some Chinese cities.
In the first half of last year, Poly made a net profit of RMB277.83 million ($40.6 million).
In the first quarter of this year, profit rose 253% to RMB 276.04 million.
Listed Chinese companies are required to make preliminary estimates of their earnings if they expect to report swings of at least 50%. Poly is expected to report its first-half earnings next month.
Now Poly Real Estate Group has said it is issuing RMB4.3 billion worth of five-year fixed-rate bonds to both institutional and individual investors. Up to 90% of the bonds will be sold to institutional investors.