In 1960s his works were focused on poetic film proclamation, he wrote the screenplay for the such a movies like "When the Cocks Go" ("Când se duc cocorii") (1963), "The street is listening" ("Strada ascultă") (1964) and "The Taste of Bread" ("Gustul pâinii") (1966).
In the 1970s, he directed the movie of historic and revolutionary character: "Delayed Explosion" ("Explozie întârziată") (1970), "The last Outlaw"("Ultimul haiduc") (1972), "After the beast" ("Pe urmele fiarei") (1976) etc.
After making the musical - "Where is love" ("Unde ești dragoste") (1981), Valieriu Gagiu screened various works of classical literature: "The history of one golden coin" ("Istoria unui galben") (1983), "The Mysterious Prisoner" ("Deținutul Misterios") (1986), "The kites do not share the prey" ("Corbii prada n-o împart") (1988), "The street of lamps off" ("Strada felinarelor stinse") (1990), "After the footsepts of Miorița" ("Pe urmele Mioriței"), etc.
During the Romanian Revolution of 1989, Valeriu Gagiu is one of the few Moldovan filmmakers to have captured the dramatic pages of the events of that time, making the documentary feature film "Bloody Christmas" (1989).
In 1992, he was next to the first line Moldavian combatants and volunteers during the armed conflict on the Dniester river, and wrote the play "The Duet for two snipers" reflecting some images of this war (a fragment was published in "The Magic Lantern" 2-3 / 1996).