The striker left the club after they were relegated last season and reportedly snubbed interest from Reading, Millwall and Notts County.
The 31-year-old former West Ham and Aston Villa player is awaiting international clearance before he can begin for Phoenix.
Phoenix, who now have a wealthy Chinese owner, are looking to bounce back into China’s Super League after being relegated last season.
Harewood could sign a permanent contract with the club if he impresses.
The striker, who started his career with Nottingham Forest, began last season with the Seasiders in promising fashion, scoring twice in a 4-0 victory over Wigan on the opening day at the DW Stadium.
Harewood failed to cement a place in the first team under Ian Holloway though, and was loaned out to Championship side Barnsley in February for the rest of the season.