when does clark meet lois lane in smallville
Season 4
Introduction
Lois Lane is a fictional character on the television series "Smallville"; she was portrayed continually by Erica Durance since her first appearance in the season four premier "Crusade" to the series finale
Season four UNANSWERABLE In season four.
Lois Lane (Smallville) Lois Lane (Smallville)
Introduction Role in "Smallville"
 Throughout seasons four, five, six and seven, Lois's relationship with Clark Kent is depicted more as a brother/sister relationship, with the two characters often butting heads.  Lois Lane makes her first appearance in season four's "Crusade" when she comes to Smallville investigating the death of her cousin Chloe Sullivan (Allison Mack). While investigating Chloe's death with Clark Kent 
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Lois Lane (Smallville) [SEP] Introduction
Lois Lane is a fictional character on the television series "Smallville"; she was portrayed continually by Erica Durance since her first appearance in the season four premier "Crusade" to the series finale. Durance began as a guest star in season four but was promoted to series regular status beginning in season five. The character of Lois Lane, first created for comic books by Jerry Siegel and Joe Shuster in 1938 to be the love interest for Clark Kent and his alter-ego Superman, was adapted to television in 2001 by Alfred Gough and Miles Millar—this is the fourth time the character has been adapted into a live-action television series.