Based　on　the　speed　survey　of　22　tangent　segments　of　two-lane　highway,　the　relation　of　roadside　clear　zone　and　operating　speed　was　obtained.　Then,　the　model　of　influence　of　clear　zone　on　the　fiducial　operating　speed　was　built.　The　relations　of　operating　speed,　fiducial　speed　and　the　interval　between　the　edge　of　the　road　and　the　street　buildings　were　studied　using　R　language　program.　The　model　of　the　influence　of　roadside　development　on　operating　speed　was　built　based　on　the　results　using　statistical　regression　analysis.　The　results　show　that　operating　speed　has　a　logarithm　relation　with　clear　zone.　Operating　speed　has　close　relation　to　the　interval　between　the　edge　of　the　road　and　the　street　buildings,　however,　it　has　poor　relation　to　the　fiducial　speed.