The Dolphins were interested in trading the No. 1 pick, but when no suitors surfaced, they decided to sign Long and avoid a possible holdout. Last year's top pick, JaMarcus Russell, missed all of training camp before signing a $61 million contract with the Oakland Raiders.
The new Miami regime led by Bill Parcells began negotiations last week with Long's agent. Offensive line is considered the biggest need for the Dolphins, who went 1-15 last year, and new Miami coach Tony Sparano coached the offensive line with the Dallas Cowboys.
Miami has eight other picks and four of the first 64.